Timeline of the Crips–Bloods gang war

The Crips and Bloods, which are among two of the largest street gangs in the United States, have been embroiled in a rivalry since 1972, with additional conflict between rival "sets" within each overarching gang. == 1970s == 1971 Stanley Williams was approached by Raymond Washington in George Washington High School, who proposed to Williams that they unite in order to defend themselves from local gangs.

Source: Wikipedia — Timeline of the Crips–Bloods gang war (CC BY-SA 4.0)